Bell extension for telephones



(No Model.)

B. S. DICKERSON.

BELL EXTENSION FOR TELEPHONES.

Patented Nov. 23, 1897.

9% waw UNITE STATES PATENT EEICE.

ERNEST S. DIOKERSON, OF PHILADELPHIA, PENNSYLVANIA.

BELL EXTENSION FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 594,131, dated November 23, 1897.

Application filed August 11, 1897.

To all whom it may concern.-

Be it known that I, ERNEST S. DIoKERsoN, a citizen of the United States, residing at the city of Philadelphia, in the county of Philardelphia and State of Pennsylvania, have ininstrument whereby the call or signal of the instrument mayjbe transmitted to an auxiliary call or signal remote thereto; and in such connection it relates particularly to the construction and arrangement of such an attach-, ment or extension.

The principal object of my invention is to provide, in connection with the call-bell of a telephone or similar instrument, a make-andbreak device adapted to control an auxiliary or local-battery circuit and the device adapted to be actuated by the call-bell or attachments of. the same to operate one or more signaling devices located in the local-battery circuit.

My invention consists of a flexible contact making and breaking arm pivoted intermediate of its ends to one of the contacts, one end of the arm resting in a'stop and the intermediate portion of the arm adapted to oscillate to make and break contact with the second contact and the two contacts introduced into an auxiliary or local-battery circuit in which are included the additional signaling devices; and my invention further consists of the improvements in a bell extension or attachment for telephone or similar instruments when constructed and arranged in substantially the manner hereinafter de scribed and claimed.

The nature and scope or characteristic features of my invention will be more fully understood from the following description ,taken in connection with the accompanying drawings, forming part hereof, in Which- Figure l is a front elevational view of the bell extension or attachment embodying the features of my invention with the case or housing sectioned to more clearly illustrate the construction and arrangement of said device. Fig. 2 is a transverse sectional view of the device, and Fig. 3 is a diagrammatic Serial No. 647,779. (No model.)

view of the attachment to a telephone receiv ing and transmitting instrument and a local battery circuit controlled by said attachment or extension.

Referring to the drawings, a represents the bottom of the casing or housing for the instrument, to which is secured a fixed contactpoint I). To this contact-point bis pivoted an arm d, the lower end d of which is thin and flexible and rests in a slotted or box-shaped stop 6, also secured to the base of the housing. The upper end of the arm dis provided with an extension d adapted to rest against or contact with the call-bell lever f of a telephone or other similar instrument g, sub stantially as indicated in Fig. l of the drawlugs.

To the base a of the casing is pivotally secured an adjustable contact 70, arranged 0pposite the flexible end cl of the arm cl and adapted to periodically engage therewith when the arm dis vibrated by the call-bell leverf. The contact leis adapted to be moved toward or away from the flexible portion d of the arm d by means of a slide or push m, operated by a button m, substantially as illustrated in Fig. 1. The contact b is connected by a wire I) with a binding-post b andthe contact his connected by a wire to a second binding-post k The posts k and b are the terminals for an auxiliary or localbattery circuit, in which is included a series of call-bells or signals 11 n adapted tobc thrown into or out of circuit by a switch n, substantially as indicated in Fig. 3. These signals or bells, it being understood,'are to be located in different rooms of ahouse or other structure more or less remote from the telephone instrument 9.

The operation of the device of my invention hereinbeforedescribed is as follows: The arm dis connected by the extension d to the righthand side of the call-bell lever f of atelephone or other similar instrument, and as the lever f vibrates to the right the arm is carried with it, thus bowing or bending its flexible portion d toward the contact 70 and setting in action one of the signals or bells n or niwhich has been switched into circuit by the switch n. As the leverf travels to the left the portion cl springs away from the contact and the local circuit is broken. WVhen the device is not in end against said lever, a contact to which said arm is pivotally secured, a stop wherein the other end of the arm rests, a second contact arranged between the stop and the first contact, all arranged so that when the call-bell lever oscillates the flexible arm will periodically engage the second contact, a local-battery circuit wherein the contacts are included, and one or more signaling devices included in said local-battery circuit, substantially as and for the purposes described.

2. The combination with the call-bell attachment of a telephone, of a Inake-and-break device, consisting of a long flexible arm pivotally connected with a contact-point, a stop in which the other end of said flexible arm rests, said arm adapted to be oscillated by said telephone call-bell attachment to swing it into and out of engagement with a second contact located between said stop and first contact and provided with a shifting device, a local-bat tery circuit wherein said contacts are adapted to be included, and one or more signaling devices in said circuit, substantially as and for the purposes described.

In testimony whereof I have hereunto set my signature in the presence of two subscribing witnesses.

ERNEST S. DICKERSON.

Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH. 

